1038. Recover the Smallest Number (30)-PAT甲级真题(贪心算法)
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1038. Recover the Smallest Number (30)
Given a collection of number segments, you are supposed to recover the smallest number from them. For example, given {32, 321, 3214, 0229, 87}, we can recover many numbers such like 32-321-3214-0229-87 or 0229-32-87-321-3214 with respect to different orders of combinations of these segments, and the smallest number is 0229-321-3214-32-87.
Input Specification:
Each input file contains one test case. Each case gives a positive integer N (<=10000) followed by N number segments. Each segment contains a non-negative integer of no more than 8 digits. All the numbers in a line are separated by a space.
Output Specification:
For each test case, print the smallest number in one line. Do not output leading zeros.
Sample Input:
5 32 321 3214 0229 87
Sample Output:
22932132143287
题目大意:给一些字符串,求它们拼接起来构成最小数字的方式
分析:贪心算法。让我们一起来见证cmp函数的强大之处!!~~~~不是按照字典序排列就可以的,必须保证两个字符串构成的数字是最小的才行,所以cmp函数写成return a + b < b + a;的形式,保证它排列按照能够组成的最小数字的形式排列。
因为字符串可能前面有0,这些要移除掉(用s.erase(s.begin())就可以了~~嗯~~string如此神奇~~~)。输出拼接后的字符串即可。
注意:如果移出了0之后发现s.length() == 0了,说明这个数是0,那么要特别地输出这个0,否则会什么都不输出。
#include <string>#include <iostream>#include <algorithm>using namespace std;bool cmp0(string a, string b) { return a + b < b + a;}string str[10010];int main() { int n; scanf("%d", &n); for(int i = 0; i < n; i++) cin >> str[i]; sort(str, str + n, cmp0); string s; for(int i = 0; i < n; i++) s += str[i]; while(s.length() != 0 && s[0] == '0') s.erase(s.begin()); if(s.length() == 0) cout << 0; else cout << s; return 0;}
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